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Simplifying -7x + -3(3x + 6) = 142 Reorder the terms: -7x + -3(6 + 3x) = 142 -7x + (6 * -3 + 3x * -3) = 142 -7x + (-18 + -9x) = 142 Reorder the terms: -18 + -7x + -9x = 142 Combine like terms: -7x + -9x = -16x -18 + -16x = 142 Solving -18 + -16x = 142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -16x = 142 + 18 Combine like terms: -18 + 18 = 0 0 + -16x = 142 + 18 -16x = 142 + 18 Combine like terms: 142 + 18 = 160 -16x = 160 Divide each side by '-16'. x = -10 Simplifying x = -10
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